Flutter: How to Refresh token when token expires during http call?

user_15733588 0
Viewed 14951

I am new to flutter and I am using http package for network call. I want to refresh token and call the request again if the response code of the request 200. How can I acheive this using http package? I heard about dio package but it is complicated for me.

User getUser(){

   final response = http.post(Uri.https(BASE_URL, '/api/user'), 
    headers: {'Authorization: Bearer $token'});

    if(response.statusCode == 200){
       return User.fromJson(jsonDecode(response.body)['user']);
    }
    else if(response.statusCode == 401){
      //refresh token and call getUser again     
    }

}
flutter-http flutter
3 Answers

You can use refresh token as follows:

User getUser(){

   final response = http.post(Uri.https(BASE_URL, '/api/user'), 
    headers: {'Authorization: Bearer $token'});

    if(response.statusCode == 200){
       return User.fromJson(jsonDecode(response.body)['user']);
    }
    else if(response.statusCode == 401){
      //refresh token and call getUser again
      final response = http.post(Uri.https(BASE_URL, '/api/[YourAuthorizationEndpoint]'), 
    headers: {'grant_type': 'refresh_token', 'refresh_token': '$refresh_token'});
      token = jsonDecode(response.body)['token'];
      refresh_token = jsonDecode(response.body)['refresh_token'];
      return getUser();
    }

}
user_24055570

You can use dart's http/retry package:

import 'package:http/http.dart' as http;
import 'package:http_retry/http_retry.dart';

final client = RetryClient(
   http.Client(), 
   retries: 1,
   when: (response) {
    return response.statusCode == 401 ? true : false;
   },
   onRetry: (req, res, retryCount) {
     if (retryCount == 0 && res?.statusCode == 401) {
        // refresh token
     }  
   },
);

try {
  final response = await client.get('http://www.example.com');
} finally {
  client.close();
}
user_78485290

call an api to refresh token after expiration

you can use this [package][1]

[1]: https://pub.dev/packages/jwt_decoder to check if token is expired

you can also get the time since token created and date of expiration

user_84834150
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